WO2008077617A1 - Joint de rail électriquement isolant et procédé de fabrication d'un joint de rail de ce type - Google Patents

Joint de rail électriquement isolant et procédé de fabrication d'un joint de rail de ce type Download PDF

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Publication number
WO2008077617A1
WO2008077617A1 PCT/EP2007/011357 EP2007011357W WO2008077617A1 WO 2008077617 A1 WO2008077617 A1 WO 2008077617A1 EP 2007011357 W EP2007011357 W EP 2007011357W WO 2008077617 A1 WO2008077617 A1 WO 2008077617A1
Authority
WO
WIPO (PCT)
Prior art keywords
rails
rail
rail portions
gap
portions
Prior art date
Application number
PCT/EP2007/011357
Other languages
English (en)
Inventor
Sido Sinnema
Siep J.H. Koedijk
Diederik J. Verheul
Original Assignee
Corus Technology Bv
Movares Nederland B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corus Technology Bv, Movares Nederland B.V. filed Critical Corus Technology Bv
Priority to EP07857068A priority Critical patent/EP2097585A1/fr
Publication of WO2008077617A1 publication Critical patent/WO2008077617A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B11/00—Rail joints
    • E01B11/54—Electrically-insulating rail joints

Definitions

  • the invention relates to an electrically insulating rail joint for insulating two rails such that the railjoint is placed between the ends of the rails, comprising an electrically insulating sheet.
  • Such insulating rail joints are known and are used to subdivide railways in consecutive sections electrically insulated from one another to be able to use these sections in signalling, security and controlling systems, such as for instance automatically controlled guarded level crossings and automatic train control.
  • a railway element with an insulating rail joint wherein a gap in the railway element to receive an electrically insulating element and the insulating element are both shaped such that the insulating element is supported in the gap.
  • the electrically insulating element is preferably comprises a ceramic material.
  • the ceramic material is in particular chosen because of its hardness and resistance to abrasion.
  • the width of the gap between the end faces of the rails will vary with variation of temperature, as a result of which the insulating element will be subject to different loads. This means that the ceramic material will also be subjected to shear and tensile forces against which ceramic material is hardly resistant. As a result the stand time of such insulating element will only be very short.
  • an electrically insulating rail joint for isolating two successive rails or rail portions with an electrically insulating element comprising a ceramic plate placed between the end faces of the rails or rail portions which rails or rail portions are connected by means of connecting means, wherein the connecting means retain a compressive force applied to the electrically insulating element between the end faces of the rails or rail portions.
  • the insulating element is retained under a compressive force by means of the connecting means connecting the rails or rail portions on both sides of the insulating element.
  • the connecting means are adapted to retain a compressive force that is sufficient to take up the tensile forces due to contraction of rails because of low temperatures as for instance during the night or in winter time. This is particularly important with continuous welded rails.
  • the electrically insulating element consists of a ceramic plate.
  • the insulating element according to this embodiment has a compression strength that is more than sufficient to withstand the compressive force exerted on it.
  • the compression strength is also more than sufficient to take up any additional compressive load due to expansion of the rails.
  • ceramic material has a low linear extension coefficient, which is typically lower than 13*10 "6 / 0 C and for a number of commercially available ceramic materials will be in the range of 7*10 "6 and 13*10 "6 / 0 C. Because of this low linear extension coefficient changes in temperature will have minimal effect on the compressive force exerted on the insulating sheet.
  • the electrically insulating element has a thickness between 1 and 20 mm, preferably a thickness of at least 3 mm, and preferably a thickness of at most 10 mm. With such a thickness of the electrically insulating element the rail ends are kept at sufficient distance to prevent short circuiting of the railjoint by for instance accumulation of abrasion powder or the like.
  • the specific electrical resistance of the above ceramic materials lie in a range of
  • the electrical resistance for a rail joint in for instance the well known UIC60 rail with one insulating sheet of for instance Zirconia with a thickness of 1 mm would be about 1 x 10 6 ⁇ .
  • the electrical resistance of the railjoint in the same rail would be about 50 x 10 12 ⁇ .
  • the form of the electrically insulating sheet follows the profile of at least the head part of the rails, the head part of the rail being the part that comes into direct contact with the wheels of the train.
  • the remaining part of the profile of the rails does not have to be followed exactly, as long as the insulating sheet completely covers - A -
  • the electrically insulating element has a tapered shape.
  • the gap between the end faces of the rails or rail portions is adapted to accommodate the tapered insulating element.
  • the invention also provides for a method for producing a rail joint in which a compressive force is exerted on an electrically insulating element placed between the end faces of two successive rails or rail portions, the method comprising the steps of:
  • the rails or rail portions are connected by means of connecting means such as fish plates, after which by elastic deformation of at least part of the connecting means the gap between the end faces of the rails or rail portions is widened enough to insert the insulation element into the gap. After insertion of the insulating element the tensile force on the rails or rail portions is released and the insulating element is clamped between the end faces of the rails or rail portions.
  • connecting means such as fish plates
  • the resulting compressive force exerted on the insulating element depends on a number of variables such as the properties of the connecting means, the length of the connecting means that is submitted to elastic deformation and the amount of elastic deformation, hi dependency of these variables the resulting compressive force can be set within a certain range.
  • the method further comprises the step of exerting a bending load force on the rails or rail portions at both sides of the gap simultaneously with the exertion of the tensile force on the rails or rail portions, in order to give the gap a tapered shape.
  • the tapered shape is such that the resulting gap between the end faces of the rails or rail portions widens in upward direction from the foot portion to the head portion of the rail.
  • the electrically insulating element preferably a ceramic plate, used with the method has a tapered shape that corresponds to the tapered shape of the tapered gap between the end faces of the rails or rail portions.
  • the advantage of this embodiment is that the rail can be cut perpendicular to the axis of the rail after which by bending the rail the tapered gap between the end faces of the rails or rail portions will result.
  • the tapered insulating element has the advantage that because of its shape it can be inserted easily in the gap between the rail ends without the need of having to open the gap to a considerable width to be able to insert the insulating element.
  • the successive rails or rail portions at both sides of the gap are connected to each other by connecting means of which the outer portions are fixedly connected to the respective rails or rail portions and wherein an intermediate portion between the outer portions is not connected to the rails.
  • the intermediate portion of the connecting means extends at both sides of the gap and symmetrically with respect to the gap-
  • the connecting means comprise fish plates at both sides of the rails or rail portions the outer portions of which are bolted to each other therewith establishing the connection to the rails or rail portions.
  • glue is applied between at least the outer portions of the connecting means and the corresponding parts of the rails and given enough time to harden.
  • the bolts are insulated from the rails or rail portions and/or the fish plates.
  • the glue is applied not only to the outer portions of the fish plates and the corresponding part of the rails, prior to the elastic deformation of the part of the fish plates between the bolted outer portions, but also over the intermediate portion of the fish plates and the corresponding parts of the rails. With the elastic deformation of the intermediate part of the fish plates also the glue is elastically deformed.
  • the connecting means are stressed after insertion of the insulation element between the end faces of the rails or rail portions
  • the connecting means comprise parts at both sides of the gap between the rails or rail portions which are connected by tensioning means.
  • the connecting means comprise a shoulder at each side of the gap and at both sides of the rails or rail portions, which shoulders form for instance part of fish plates connected to the rails or rail portions, and the shoulders are connected by a tension rod. After insertion of the insulating sheet the tension rods provided on both sides of the rails or rail portions are tightened up to the desired compressive force exerted on the insulating sheet.
  • the fish plates are connected to the rail portions by means of an adhesive layer between fish plates and rail portions and/or by means of bolts and nuts.
  • the fishplates are connected to the rail portions by means of an insulating adhesive interlayer.
  • Each tension rod is connected to the respective shoulders of the connecting means using an insulating bush between the tension rod and each shoulder.
  • an insulating adhesive By using an insulating adhesive a double security against short circuiting through the tensioning means is obtained.
  • insulating the tension rods from the fishplates will give sufficient insulation.
  • the rail joint according to the invention can be mounted in an existing railway, however according to a further elaboration of the invention a railway part is provided comprising two rail portions with a railjoint according to the invention between the rail portions.
  • Such a railway part is mounted as a prefabricated unit in an existing railway by removing a corresponding part from the railway and replacing it by the railway part according to the invention.
  • the railway part is connected to the existing railway by means of for instance welding techniques as commonly used in railway construction and maintenance.
  • the advantage of using a prefabricated railway part is that the railjoint can be mounted between rail portions under the best possible conditions in a workshop ensuring an optimal fit of the railjoint between the rail portions.
  • a further advantage of prefabricating the railway part is that it is possible to manufacture the railway part in serial or batch production therewith lowering the costs per unit.
  • the railway parts according to the invention may be inserted in an existing railway by taking out a corresponding length of the original railway and replacing it by the railway part.
  • the railway part is preferably connected to the existing rail such as to form a continuous welded rails.
  • railway parts are placed in the railway such that the rail joint in the railway parts is positioned between two sleepers of the railway. Since the space required for the fastening and/or positioning means with which a rail is mounted on the sleepers will leave only very little space for the connecting means for the rail joint, it is preferred to have the rail joint between sleepers.
  • the dimensions of the connecting means are chosen such that there remains enough space to fit within the security profile of a ballast tamping machine for tamping ballast underneath the sleepers of the railway, hi the maintenance of a railway tamping ballast underneath the sleepers is done from time to time to keep good support and stability for the rails. This is particularly important for sleepers that support the railway part according the invention to ensure prevention of mechanical failure of the rail joint.
  • fig.1 shows a side view of two rail portions provided with a rail joint
  • fig.2 shows a configuration to apply a bending load force to the rail joint.
  • hi fig.l two rail portions 1,2 are shown with a foot, neck and head portion 3,4,5 respectively.
  • the rail portions 1 ,2 are connected by means of fish plates 6 on both sides of the rail portions 1,2 and bolts 7.
  • a gap 8 of a predetermined width is kept, which preferably is in a range of 3-10 mm, for instance 5 mm. It is of utmost importance that the gap 8 has minimal deviations, especially in the railhead to avoid misalignment in the horizontal plane.
  • the fish plates 6 and rail portions 1,2 are first provided with corresponding boreholes after which the bolts 7 are put through fishplates 6 and rail portions 1,2. Before tightening bolts 7 the fish plates 6 are glued to the rail portions 1,2.
  • the glue layer has a thickness of for instance 4 mm, for which plastic shims of the same thickness are used between the rail portions 1,2 and the fish plates 6.
  • Glue is applied at the outer portions 9,10 of the fish plates 6, which are the portions provided with bolts 7.
  • the intermediate area 11 between the outer portions 9,10 is not glued, at least not in this example prior to the elastic deformation of this intermediate area. After hardening of the glue, the bolts are pre-stressed by tightening the bolts.
  • these portions are roughened by for instance grid blasting. Immediately afterwards these portions are preferably coated with a thin layer of glue in order to prevent oxidation.
  • a tensile load is applied to the rail portions 1,2.
  • holes 12 may be provided in the rail portions 1,2 to affix the means with which the tensile load is applied.
  • the load is applied in a single step or in a number of successive steps to a predetermined maximum load.
  • This tensile load is preferably in a range of 500 - 2500 kN and more preferably in a range of 1000 - 2000.
  • the load is preferably raised in steps of 300 - 700 kN, more preferably in steps of 500 kN.
  • a three point bending device 13 is shown with a beam 18, a central support 14 under gap 8 and on both outer ends of beam 18 connecting members 15,16 which connect the outer ends of beam 18 at points 19,20 with the rail portions 1 and 2 at equal distances from gap 8.
  • the distances between points 19,20 and gap 8 is 500 mm.
  • the vertical load is applied by moving the central support 14 in upward direction.
  • the gap 8 is bend to a predetermined tapered shape, with the larger width at the head of the rail, which corresponds to the tapered shape of ceramic element 17 .
  • a gap of 5 mm was taken as starting point after which first a tensile load was applied on the joint and then a bending load wherewith the centre of the joint was bended up to a value of 0.625 mm measured on a one meter base. This corresponds with an inclination of 1:400 over 500 mm.
  • the difference in width of gap 8 between rail head and rail foot is about 0.4 mm after bending.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)

Abstract

L'objet de la présente invention concerne un joint de rail électriquement isolant destiné à isoler deux rails successifs ou deux portions de rail (1, 2) au moyen d'un élément isolant en céramique (17) situé entre les faces d'extrémité des rails ou des portions de rail (1, 2) tandis que des moyens de connexion, (6, 7) fournis pour relier les rails ou les portions de rails, sont adaptés de manière à exercer une force de compression sur l'élément électriquement isolant (17) situé entre les faces d'extrémité des rails ou des portions de rail (1, 2). Le procédé de fabrication d'un tel joint de rail pour une partie de rail comprend les étapes suivantes : ménager un écart entre deux portions successives de rail (1, 2), relier les portions de rail les unes aux autres, exercer une force de traction sur les portions de rail, insérer un élément électriquement isolant (17) dans l'espace ménagé entre les faces d'extrémité des portions de rail (1, 2) et relâcher la force de traction exercée sur les portions de rail des deux côtés de l'espace.
PCT/EP2007/011357 2006-12-22 2007-12-21 Joint de rail électriquement isolant et procédé de fabrication d'un joint de rail de ce type WO2008077617A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07857068A EP2097585A1 (fr) 2006-12-22 2007-12-21 Joint de rail électriquement isolant et procédé de fabrication d'un joint de rail de ce type

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06026744 2006-12-22
EP06026744.0 2006-12-22

Publications (1)

Publication Number Publication Date
WO2008077617A1 true WO2008077617A1 (fr) 2008-07-03

Family

ID=38055566

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/011357 WO2008077617A1 (fr) 2006-12-22 2007-12-21 Joint de rail électriquement isolant et procédé de fabrication d'un joint de rail de ce type

Country Status (2)

Country Link
EP (1) EP2097585A1 (fr)
WO (1) WO2008077617A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2206830A1 (fr) 2009-01-13 2010-07-14 Corus Technology BV Joint à isolation électrique et son procédé de fabrication
WO2014209109A1 (fr) 2013-06-25 2014-12-31 Movares Nederland B.V. Procédé destiné à fournir un joint de rail
CN108442189A (zh) * 2018-05-24 2018-08-24 贾守训 一种钢轨连接头

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3727838A (en) 1971-07-26 1973-04-17 Minnesota Mining & Mfg Steel-ceramic railjoint endpost
US4209130A (en) * 1977-11-14 1980-06-24 Minnesota Mining And Manufacturing Company Adhesive tape for protecting electrically insulated rail joint
EP0242350A2 (fr) * 1986-04-18 1987-10-21 VOEST-ALPINE Aktiengesellschaft Isolement électrique d'un joint de rail et procédé de fabrication d'un isolement électrique d'un joint de rail
US4773590A (en) * 1987-03-30 1988-09-27 Tasa Corporation Separated end post joint
EP1164222A1 (fr) * 2000-06-12 2001-12-19 Balfour Beatty PLC Joint de rail isolé
WO2003048456A1 (fr) * 2001-12-07 2003-06-12 Kevin Francis Edsall Separateur de rails et procede permettant de separer une paire de rails
WO2005122674A2 (fr) * 2004-06-17 2005-12-29 Jude Igwemezie Dispositif pour la jonction de rails
EP1693515A1 (fr) 2005-02-21 2006-08-23 Volker Rail Nederland BV Rail avec eclissage isolant

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3727838A (en) 1971-07-26 1973-04-17 Minnesota Mining & Mfg Steel-ceramic railjoint endpost
US4209130A (en) * 1977-11-14 1980-06-24 Minnesota Mining And Manufacturing Company Adhesive tape for protecting electrically insulated rail joint
EP0242350A2 (fr) * 1986-04-18 1987-10-21 VOEST-ALPINE Aktiengesellschaft Isolement électrique d'un joint de rail et procédé de fabrication d'un isolement électrique d'un joint de rail
US4773590A (en) * 1987-03-30 1988-09-27 Tasa Corporation Separated end post joint
EP1164222A1 (fr) * 2000-06-12 2001-12-19 Balfour Beatty PLC Joint de rail isolé
WO2003048456A1 (fr) * 2001-12-07 2003-06-12 Kevin Francis Edsall Separateur de rails et procede permettant de separer une paire de rails
WO2005122674A2 (fr) * 2004-06-17 2005-12-29 Jude Igwemezie Dispositif pour la jonction de rails
EP1693515A1 (fr) 2005-02-21 2006-08-23 Volker Rail Nederland BV Rail avec eclissage isolant

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2206830A1 (fr) 2009-01-13 2010-07-14 Corus Technology BV Joint à isolation électrique et son procédé de fabrication
WO2010081520A1 (fr) 2009-01-13 2010-07-22 Corus Technology Bv Joint de rail électriquement isolant et procédé de fabrication d'un tel joint de rail
WO2014209109A1 (fr) 2013-06-25 2014-12-31 Movares Nederland B.V. Procédé destiné à fournir un joint de rail
NL2011036C2 (en) * 2013-06-25 2015-01-05 Movares Nederland Bv Method for providing a rail joint of two adjacent rail portions.
CN108442189A (zh) * 2018-05-24 2018-08-24 贾守训 一种钢轨连接头

Also Published As

Publication number Publication date
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